# Charts & Visualization Tools

> Charts, function graphs, mind maps, flowcharts, Gantt charts, word clouds, waveforms, spectrograms and algorithm visualizations.

- URL: https://qilingtools.com/en/tags/chart
- Price: Free, no sign-up
- Privacy: Runs locally in the browser; files are never uploaded

## Tools (15)

- [QiLing Mind](https://qilingtools.com/en/mindmap): QiLing Mind is a free online mind map editor: add nodes with Tab/Enter, drag to restructure, import and export XMind and Markdown, export PNG/SVG/PDF.
- [Graphing Calculator](https://qilingtools.com/en/math/graph): Free online function graphing calculator: type sin(x), x^2 or 1/x and see the curve at once, with several functions, parametric and polar curves, PNG export.
- [Audio Waveform Generator](https://qilingtools.com/en/audio/waveform): Free online audio waveform generator: render MP3, WAV and more as bar, mirrored, line or filled sound-wave images with custom colors and sizes. PNG and SVG.
- [Chart Maker](https://qilingtools.com/en/chart): Free online chart maker: paste data from Excel or CSV to build bar, line, area, pie, donut and scatter charts, then download a 2× PNG or an editable SVG.
- [3D Surface Plotter](https://qilingtools.com/en/math/3d-graph): Free online 3D surface plotter: type z = f(x, y) and drag to rotate a height-coloured surface — solid, wireframe or contour, several at once, with PNG export.
- [Audio Spectrogram](https://qilingtools.com/en/audio/spectrogram): Free online spectrogram generator: see time, frequency and level from a Hann-windowed STFT, with FFT size, log axis, dB range and colour maps. Exports PNG.
- [Word Cloud Generator](https://qilingtools.com/en/word-cloud): Free word cloud maker: paste text or open a file, word counts with stopword removal, editable frequency table, heart, star or image shapes, PNG and SVG.
- [Regex Visualizer](https://qilingtools.com/en/regex-visualizer): Visualize JavaScript regexes as railroad diagrams with a plain-language breakdown of groups, quantifiers, classes and lookarounds. Export SVG or PNG.
- [Flowchart Maker](https://qilingtools.com/en/flowchart): Free flowchart maker: describe nodes and links in plain text (Mermaid flowchart syntax) for an auto-laid-out diagram with shapes and themes. SVG/PNG export.
- [Gantt Chart Maker](https://qilingtools.com/en/gantt): Free online Gantt chart maker: tasks with dates or durations, progress, milestones and dependencies, working days, drag to reschedule, PNG/SVG/CSV export.
- [Box Plot Maker](https://qilingtools.com/en/math/box-plot): Box and whisker plots from pasted columns: Tukey, TI-84, Excel INC/EXC or Minitab quartiles, 1.5×IQR and 3×IQR outliers, mean, notches, PNG/SVG export.
- [Graph Theory Algorithm Visualizer](https://qilingtools.com/en/math/graph-theory): Draw a graph, step through BFS, DFS, Dijkstra, Bellman-Ford, Floyd–Warshall, Prim, Kruskal, topological sort, SCCs, bipartite check, Euler paths and max flow.
- [Fourier Series & FFT Visualizer](https://qilingtools.com/en/math/fourier): Fourier series coefficients and animated partial sums for square, sawtooth, triangle or any function (Gibbs), draw-your-own epicycles and FFT spectra.
- [Fractal Explorer](https://qilingtools.com/en/math/fractal): Zoom into the Mandelbrot set, Julia sets, Burning Ship, Tricorn and Newton fractals with multithreaded rendering, plus L-systems and the Barnsley fern.
- [Sorting Algorithm Visualizer](https://qilingtools.com/en/sorting-visualizer): Watch 14 sorting algorithms animate: bubble, insertion, shell, merge, quick, heap, counting, radix, bucket and Timsort, with counters, step mode and races.